1 //===-- MachVMMemory.cpp ----------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Created by Greg Clayton on 6/26/07. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "MachVMMemory.h" 15 #include "MachVMRegion.h" 16 #include "DNBLog.h" 17 #include <mach/mach_vm.h> 18 19 MachVMMemory::MachVMMemory() : 20 m_page_size (kInvalidPageSize), 21 m_err (0) 22 { 23 } 24 25 MachVMMemory::~MachVMMemory() 26 { 27 } 28 29 nub_size_t 30 MachVMMemory::PageSize() 31 { 32 if (m_page_size == kInvalidPageSize) 33 { 34 m_err = ::host_page_size( ::mach_host_self(), &m_page_size); 35 if (m_err.Fail()) 36 m_page_size = 0; 37 } 38 return m_page_size; 39 } 40 41 nub_size_t 42 MachVMMemory::MaxBytesLeftInPage(nub_addr_t addr, nub_size_t count) 43 { 44 const nub_size_t page_size = PageSize(); 45 if (page_size > 0) 46 { 47 nub_size_t page_offset = (addr % page_size); 48 nub_size_t bytes_left_in_page = page_size - page_offset; 49 if (count > bytes_left_in_page) 50 count = bytes_left_in_page; 51 } 52 return count; 53 } 54 55 nub_size_t 56 MachVMMemory::Read(task_t task, nub_addr_t address, void *data, nub_size_t data_count) 57 { 58 if (data == NULL || data_count == 0) 59 return 0; 60 61 nub_size_t total_bytes_read = 0; 62 nub_addr_t curr_addr = address; 63 uint8_t *curr_data = (uint8_t*)data; 64 while (total_bytes_read < data_count) 65 { 66 mach_vm_size_t curr_size = MaxBytesLeftInPage(curr_addr, data_count - total_bytes_read); 67 mach_msg_type_number_t curr_bytes_read = 0; 68 vm_offset_t vm_memory = NULL; 69 m_err = ::mach_vm_read (task, curr_addr, curr_size, &vm_memory, &curr_bytes_read); 70 if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail()) 71 m_err.LogThreaded("::mach_vm_read ( task = 0x%4.4x, addr = 0x%8.8llx, size = %llu, data => %8.8p, dataCnt => %i )", task, (uint64_t)curr_addr, (uint64_t)curr_size, vm_memory, curr_bytes_read); 72 73 if (m_err.Success()) 74 { 75 if (curr_bytes_read != curr_size) 76 { 77 if (DNBLogCheckLogBit(LOG_MEMORY)) 78 m_err.LogThreaded("::mach_vm_read ( task = 0x%4.4x, addr = 0x%8.8llx, size = %llu, data => %8.8p, dataCnt=>%i ) only read %u of %llu bytes", task, (uint64_t)curr_addr, (uint64_t)curr_size, vm_memory, curr_bytes_read, curr_bytes_read, (uint64_t)curr_size); 79 } 80 ::memcpy (curr_data, (void *)vm_memory, curr_bytes_read); 81 ::vm_deallocate (mach_task_self (), vm_memory, curr_bytes_read); 82 total_bytes_read += curr_bytes_read; 83 curr_addr += curr_bytes_read; 84 curr_data += curr_bytes_read; 85 } 86 else 87 { 88 break; 89 } 90 } 91 return total_bytes_read; 92 } 93 94 95 nub_size_t 96 MachVMMemory::Write(task_t task, nub_addr_t address, const void *data, nub_size_t data_count) 97 { 98 MachVMRegion vmRegion(task); 99 100 nub_size_t total_bytes_written = 0; 101 nub_addr_t curr_addr = address; 102 const uint8_t *curr_data = (const uint8_t*)data; 103 104 105 while (total_bytes_written < data_count) 106 { 107 if (vmRegion.GetRegionForAddress(curr_addr)) 108 { 109 mach_vm_size_t curr_data_count = data_count - total_bytes_written; 110 mach_vm_size_t region_bytes_left = vmRegion.BytesRemaining(curr_addr); 111 if (region_bytes_left == 0) 112 { 113 break; 114 } 115 if (curr_data_count > region_bytes_left) 116 curr_data_count = region_bytes_left; 117 118 if (vmRegion.SetProtections(curr_addr, curr_data_count, VM_PROT_READ | VM_PROT_WRITE)) 119 { 120 nub_size_t bytes_written = WriteRegion(task, curr_addr, curr_data, curr_data_count); 121 if (bytes_written <= 0) 122 { 123 // Error should have already be posted by WriteRegion... 124 break; 125 } 126 else 127 { 128 total_bytes_written += bytes_written; 129 curr_addr += bytes_written; 130 curr_data += bytes_written; 131 } 132 } 133 else 134 { 135 DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS, "Failed to set read/write protections on region for address: [0x%8.8llx-0x%8.8llx)", (uint64_t)curr_addr, (uint64_t)(curr_addr + curr_data_count)); 136 break; 137 } 138 } 139 else 140 { 141 DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS, "Failed to get region for address: 0x%8.8llx", (uint64_t)address); 142 break; 143 } 144 } 145 146 return total_bytes_written; 147 } 148 149 150 nub_size_t 151 MachVMMemory::WriteRegion(task_t task, const nub_addr_t address, const void *data, const nub_size_t data_count) 152 { 153 if (data == NULL || data_count == 0) 154 return 0; 155 156 nub_size_t total_bytes_written = 0; 157 nub_addr_t curr_addr = address; 158 const uint8_t *curr_data = (const uint8_t*)data; 159 while (total_bytes_written < data_count) 160 { 161 mach_msg_type_number_t curr_data_count = MaxBytesLeftInPage(curr_addr, data_count - total_bytes_written); 162 m_err = ::mach_vm_write (task, curr_addr, (pointer_t) curr_data, curr_data_count); 163 if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail()) 164 m_err.LogThreaded("::mach_vm_write ( task = 0x%4.4x, addr = 0x%8.8llx, data = %8.8p, dataCnt = %u )", task, (uint64_t)curr_addr, curr_data, curr_data_count); 165 166 #if !defined (__i386__) && !defined (__x86_64__) 167 vm_machine_attribute_val_t mattr_value = MATTR_VAL_CACHE_FLUSH; 168 169 m_err = ::vm_machine_attribute (task, curr_addr, curr_data_count, MATTR_CACHE, &mattr_value); 170 if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail()) 171 m_err.LogThreaded("::vm_machine_attribute ( task = 0x%4.4x, addr = 0x%8.8llx, size = %u, attr = MATTR_CACHE, mattr_value => MATTR_VAL_CACHE_FLUSH )", task, (uint64_t)curr_addr, curr_data_count); 172 #endif 173 174 if (m_err.Success()) 175 { 176 total_bytes_written += curr_data_count; 177 curr_addr += curr_data_count; 178 curr_data += curr_data_count; 179 } 180 else 181 { 182 break; 183 } 184 } 185 return total_bytes_written; 186 } 187