| //===-- MachVMMemory.cpp ----------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Created by Greg Clayton on 6/26/07. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MachVMMemory.h" |
| #include "MachVMRegion.h" |
| #include "DNBLog.h" |
| #include <mach/mach_vm.h> |
| |
| MachVMMemory::MachVMMemory() : |
| m_page_size (kInvalidPageSize), |
| m_err (0) |
| { |
| } |
| |
| MachVMMemory::~MachVMMemory() |
| { |
| } |
| |
| nub_size_t |
| MachVMMemory::PageSize() |
| { |
| if (m_page_size == kInvalidPageSize) |
| { |
| m_err = ::host_page_size( ::mach_host_self(), &m_page_size); |
| if (m_err.Fail()) |
| m_page_size = 0; |
| } |
| return m_page_size; |
| } |
| |
| nub_size_t |
| MachVMMemory::MaxBytesLeftInPage(nub_addr_t addr, nub_size_t count) |
| { |
| const nub_size_t page_size = PageSize(); |
| if (page_size > 0) |
| { |
| nub_size_t page_offset = (addr % page_size); |
| nub_size_t bytes_left_in_page = page_size - page_offset; |
| if (count > bytes_left_in_page) |
| count = bytes_left_in_page; |
| } |
| return count; |
| } |
| |
| nub_bool_t |
| MachVMMemory::GetMemoryRegionInfo(task_t task, nub_addr_t address, DNBRegionInfo *region_info) |
| { |
| MachVMRegion vmRegion(task); |
| |
| if (vmRegion.GetRegionForAddress(address)) |
| { |
| region_info->addr = vmRegion.StartAddress(); |
| region_info->size = vmRegion.GetByteSize(); |
| region_info->permissions = vmRegion.GetDNBPermissions(); |
| } |
| else |
| { |
| region_info->addr = address; |
| region_info->size = 0; |
| if (vmRegion.GetError().Success()) |
| { |
| // vmRegion.GetRegionForAddress() return false, indicating that "address" |
| // wasn't in a valid region, but the "vmRegion" info was successfully |
| // read from the task which means the info describes the next valid |
| // region from which we can infer the size of this invalid region |
| mach_vm_address_t start_addr = vmRegion.StartAddress(); |
| if (address < start_addr) |
| region_info->size = start_addr - address; |
| } |
| // If we can't get any infor about the size from the next region, just fill |
| // 1 in as the byte size |
| if (region_info->size == 0) |
| region_info->size = 1; |
| |
| // Not readable, writeable or executable |
| region_info->permissions = 0; |
| } |
| return true; |
| } |
| |
| nub_size_t |
| MachVMMemory::Read(task_t task, nub_addr_t address, void *data, nub_size_t data_count) |
| { |
| if (data == NULL || data_count == 0) |
| return 0; |
| |
| nub_size_t total_bytes_read = 0; |
| nub_addr_t curr_addr = address; |
| uint8_t *curr_data = (uint8_t*)data; |
| while (total_bytes_read < data_count) |
| { |
| mach_vm_size_t curr_size = MaxBytesLeftInPage(curr_addr, data_count - total_bytes_read); |
| mach_msg_type_number_t curr_bytes_read = 0; |
| vm_offset_t vm_memory = NULL; |
| m_err = ::mach_vm_read (task, curr_addr, curr_size, &vm_memory, &curr_bytes_read); |
| |
| if (DNBLogCheckLogBit(LOG_MEMORY)) |
| 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); |
| |
| if (m_err.Success()) |
| { |
| if (curr_bytes_read != curr_size) |
| { |
| if (DNBLogCheckLogBit(LOG_MEMORY)) |
| 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); |
| } |
| ::memcpy (curr_data, (void *)vm_memory, curr_bytes_read); |
| ::vm_deallocate (mach_task_self (), vm_memory, curr_bytes_read); |
| total_bytes_read += curr_bytes_read; |
| curr_addr += curr_bytes_read; |
| curr_data += curr_bytes_read; |
| } |
| else |
| { |
| break; |
| } |
| } |
| return total_bytes_read; |
| } |
| |
| |
| nub_size_t |
| MachVMMemory::Write(task_t task, nub_addr_t address, const void *data, nub_size_t data_count) |
| { |
| MachVMRegion vmRegion(task); |
| |
| nub_size_t total_bytes_written = 0; |
| nub_addr_t curr_addr = address; |
| const uint8_t *curr_data = (const uint8_t*)data; |
| |
| |
| while (total_bytes_written < data_count) |
| { |
| if (vmRegion.GetRegionForAddress(curr_addr)) |
| { |
| mach_vm_size_t curr_data_count = data_count - total_bytes_written; |
| mach_vm_size_t region_bytes_left = vmRegion.BytesRemaining(curr_addr); |
| if (region_bytes_left == 0) |
| { |
| break; |
| } |
| if (curr_data_count > region_bytes_left) |
| curr_data_count = region_bytes_left; |
| |
| if (vmRegion.SetProtections(curr_addr, curr_data_count, VM_PROT_READ | VM_PROT_WRITE)) |
| { |
| nub_size_t bytes_written = WriteRegion(task, curr_addr, curr_data, curr_data_count); |
| if (bytes_written <= 0) |
| { |
| // Error should have already be posted by WriteRegion... |
| break; |
| } |
| else |
| { |
| total_bytes_written += bytes_written; |
| curr_addr += bytes_written; |
| curr_data += bytes_written; |
| } |
| } |
| else |
| { |
| 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)); |
| break; |
| } |
| } |
| else |
| { |
| DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS, "Failed to get region for address: 0x%8.8llx", (uint64_t)address); |
| break; |
| } |
| } |
| |
| return total_bytes_written; |
| } |
| |
| |
| nub_size_t |
| MachVMMemory::WriteRegion(task_t task, const nub_addr_t address, const void *data, const nub_size_t data_count) |
| { |
| if (data == NULL || data_count == 0) |
| return 0; |
| |
| nub_size_t total_bytes_written = 0; |
| nub_addr_t curr_addr = address; |
| const uint8_t *curr_data = (const uint8_t*)data; |
| while (total_bytes_written < data_count) |
| { |
| mach_msg_type_number_t curr_data_count = MaxBytesLeftInPage(curr_addr, data_count - total_bytes_written); |
| m_err = ::mach_vm_write (task, curr_addr, (pointer_t) curr_data, curr_data_count); |
| if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail()) |
| 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); |
| |
| #if !defined (__i386__) && !defined (__x86_64__) |
| vm_machine_attribute_val_t mattr_value = MATTR_VAL_CACHE_FLUSH; |
| |
| m_err = ::vm_machine_attribute (task, curr_addr, curr_data_count, MATTR_CACHE, &mattr_value); |
| if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail()) |
| 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); |
| #endif |
| |
| if (m_err.Success()) |
| { |
| total_bytes_written += curr_data_count; |
| curr_addr += curr_data_count; |
| curr_data += curr_data_count; |
| } |
| else |
| { |
| break; |
| } |
| } |
| return total_bytes_written; |
| } |
