mem_map.cc revision ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cf
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 1927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom#include <sys/mman.h> 2027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 216c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "ScopedFd.h" 22ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes#include "stringprintf.h" 236c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "utils.h" 246c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 25ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes#include <corkscrew/map_info.h> 26ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes 276c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#define USE_ASHMEM 1 286c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 296c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 306c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include <cutils/ashmem.h> 316c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 326c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 3327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstromnamespace art { 3427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 3596970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes#if !defined(NDEBUG) 3696970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 37ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughesstatic std::ostream& operator<<(std::ostream& os, map_info_t* rhs) { 38ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes for (map_info_t* m = rhs; m != NULL; m = m->next) { 39ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes os << StringPrintf("%08x-%08x %c%c %s\n",m->start, 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 58ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes << StringPrintf("Requested region %08x-%08x overlaps with existing map %08x-%08x (%s)\n", 59ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes base, limit, m->start, m->end, m->name) 60ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes << map_info_list; 6196970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes } 62ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes free_map_info_list(map_info_list); 6327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 6427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 6596970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes#else 661bac54ffa933fbe9b92b62437577f2f4583eff1aElliott Hughesstatic void CheckMapRequest(byte*, size_t) { } 6796970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes#endif 6896970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 69ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott HughesMemMap* MemMap::MapAnonymous(const char* name, byte* addr, size_t byte_count, int prot) { 70ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CHECK_NE(0U, byte_count); 7127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 72ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 73ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CheckMapRequest(addr, page_aligned_byte_count); 746c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 756c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 76ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes ScopedFd fd(ashmem_create_region(name, page_aligned_byte_count)); 776c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes int flags = MAP_PRIVATE; 786c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes if (fd.get() == -1) { 796c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes PLOG(ERROR) << "ashmem_create_region failed (" << name << ")"; 806c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes return NULL; 816c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes } 826c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#else 836c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes ScopedFd fd(-1); 846c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes int flags = MAP_PRIVATE | MAP_ANONYMOUS; 856c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 866c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 87ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes byte* actual = reinterpret_cast<byte*>(mmap(addr, page_aligned_byte_count, prot, flags, fd.get(), 0)); 8827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 89ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes PLOG(ERROR) << "mmap(" << reinterpret_cast<void*>(addr) << ", " << page_aligned_byte_count 905ea8d4b0912a5bc139be21fc901f982a6b023675Elliott Hughes << ", " << prot << ", " << flags << ", " << fd.get() << ", 0) failed for " << name; 9127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return NULL; 9227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 93ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes return new MemMap(actual, byte_count, actual, page_aligned_byte_count); 9427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 9527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 96ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott HughesMemMap* MemMap::MapFileAtAddress(byte* addr, size_t byte_count, int prot, int flags, int fd, off_t start) { 97ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CHECK_NE(0U, byte_count); 9827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 9927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, flags & (MAP_SHARED | MAP_PRIVATE)); 100ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes // Adjust 'offset' and 'byte_count' to be page-aligned. 10127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom int page_offset = start % kPageSize; 10227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom off_t page_aligned_offset = start - page_offset; 103ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count + page_offset, kPageSize); 104ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CheckMapRequest(addr, page_aligned_byte_count); 10527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom byte* actual = reinterpret_cast<byte*>(mmap(addr, 106ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes page_aligned_byte_count, 10727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom prot, 10827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom flags, 10927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom fd, 11027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom page_aligned_offset)); 11127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 11227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom PLOG(ERROR) << "mmap failed"; 11327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return NULL; 11427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 115ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes return new MemMap(actual + page_offset, byte_count, actual, page_aligned_byte_count); 11627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 11727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 11827ec961a1da540ba7f16c07a682585ab167317adBrian CarlstromMemMap::~MemMap() { 11930fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers if (base_begin_ == NULL && base_size_ == 0) { 12027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return; 12127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 12230fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers int result = munmap(base_begin_, base_size_); 12327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (result == -1) { 12427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom PLOG(FATAL) << "munmap failed"; 12527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 12627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 12727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 12830fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian RogersMemMap::MemMap(byte* begin, size_t size, void* base_begin, size_t base_size) 12930fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers : begin_(begin), size_(size), base_begin_(base_begin), base_size_(base_size) { 13030fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK(begin_ != NULL); 13130fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK_NE(size_, 0U); 13230fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK(base_begin_ != NULL); 13330fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK_NE(base_size_, 0U); 13427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom}; 13527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 136d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 137d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chienbool MemMap::Protect(int prot) { 138d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (base_begin_ == NULL && base_size_ == 0) { 139d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 140d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 141d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 142d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (mprotect(base_begin_, base_size_, prot) == 0) { 143d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 144d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 145d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 146a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao PLOG(ERROR) << "mprotect(" << reinterpret_cast<void*>(base_begin_) << ", " << base_size_ << ", " 147a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao << prot << ") failed"; 148d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return false; 149d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien} 150d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 15127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} // namespace art 152