9ea6dd5cfa
Add a new feature to process save-core on Darwin systems -- for lldb to create a user process corefile with only the dirty (modified memory) pages included. All of the binaries that were used in the corefile are assumed to still exist on the system for the duration of the use of the corefile. A new --style option to process save-core is added, so a full corefile can be requested if portability across systems, or across time, is needed for this corefile. debugserver can now identify the dirty pages in a memory region when queried with qMemoryRegionInfo, and the size of vm pages is given in qHostInfo. Create a new "all image infos" LC_NOTE for Mach-O which allows us to describe all of the binaries that were loaded in the process -- load address, UUID, file path, segment load addresses, and optionally whether code from the binary was executing on any thread. The old "read dyld_all_image_infos and then the in-memory Mach-O load commands to get segment load addresses" no longer works when we only have dirty memory. rdar://69670807 Differential Revision: https://reviews.llvm.org/D88387
342 lines
12 KiB
C++
342 lines
12 KiB
C++
//===-- MachVMMemory.cpp ----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Created by Greg Clayton on 6/26/07.
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//
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//===----------------------------------------------------------------------===//
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#include "MachVMMemory.h"
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#include "DNBLog.h"
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#include "MachVMRegion.h"
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#include <dlfcn.h>
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#include <mach/mach_vm.h>
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#include <mach/shared_region.h>
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#include <sys/sysctl.h>
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#if defined(WITH_FBS) || defined(WITH_BKS)
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extern "C" {
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#import <System/sys/kern_memorystatus.h>
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}
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#endif
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static const vm_size_t kInvalidPageSize = ~0;
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MachVMMemory::MachVMMemory() : m_page_size(kInvalidPageSize), m_err(0) {}
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MachVMMemory::~MachVMMemory() {}
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nub_size_t MachVMMemory::PageSize(task_t task) {
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if (m_page_size == kInvalidPageSize) {
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#if defined(TASK_VM_INFO) && TASK_VM_INFO >= 22
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if (task != TASK_NULL) {
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kern_return_t kr;
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mach_msg_type_number_t info_count = TASK_VM_INFO_COUNT;
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task_vm_info_data_t vm_info;
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kr = task_info(task, TASK_VM_INFO, (task_info_t)&vm_info, &info_count);
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if (kr == KERN_SUCCESS) {
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DNBLogThreadedIf(
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LOG_TASK,
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"MachVMMemory::PageSize task_info returned page size of 0x%x",
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(int)vm_info.page_size);
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m_page_size = vm_info.page_size;
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return m_page_size;
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} else {
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DNBLogThreadedIf(LOG_TASK, "MachVMMemory::PageSize task_info call "
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"failed to get page size, TASK_VM_INFO %d, "
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"TASK_VM_INFO_COUNT %d, kern return %d",
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TASK_VM_INFO, TASK_VM_INFO_COUNT, kr);
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}
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}
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#endif
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m_err = ::host_page_size(::mach_host_self(), &m_page_size);
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if (m_err.Fail())
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m_page_size = 0;
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}
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return m_page_size;
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}
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nub_size_t MachVMMemory::MaxBytesLeftInPage(task_t task, nub_addr_t addr,
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nub_size_t count) {
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const nub_size_t page_size = PageSize(task);
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if (page_size > 0) {
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nub_size_t page_offset = (addr % page_size);
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nub_size_t bytes_left_in_page = page_size - page_offset;
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if (count > bytes_left_in_page)
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count = bytes_left_in_page;
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}
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return count;
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}
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#define MAX_STACK_ALLOC_DISPOSITIONS \
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(16 * 1024 / sizeof(int)) // 16K of allocations
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std::vector<nub_addr_t> get_dirty_pages(task_t task, mach_vm_address_t addr,
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mach_vm_size_t size) {
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std::vector<nub_addr_t> dirty_pages;
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int pages_to_query = size / vm_page_size;
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// Don't try to fetch too many pages' dispositions in a single call or we
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// could blow our stack out.
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mach_vm_size_t dispositions_size =
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std::min(pages_to_query, (int)MAX_STACK_ALLOC_DISPOSITIONS);
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int dispositions[dispositions_size];
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mach_vm_size_t chunk_count =
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((pages_to_query + MAX_STACK_ALLOC_DISPOSITIONS - 1) /
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MAX_STACK_ALLOC_DISPOSITIONS);
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for (mach_vm_size_t cur_disposition_chunk = 0;
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cur_disposition_chunk < chunk_count; cur_disposition_chunk++) {
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mach_vm_size_t dispositions_already_queried =
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cur_disposition_chunk * MAX_STACK_ALLOC_DISPOSITIONS;
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mach_vm_size_t chunk_pages_to_query = std::min(
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pages_to_query - dispositions_already_queried, dispositions_size);
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mach_vm_address_t chunk_page_aligned_start_addr =
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addr + (dispositions_already_queried * vm_page_size);
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kern_return_t kr = mach_vm_page_range_query(
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task, chunk_page_aligned_start_addr,
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chunk_pages_to_query * vm_page_size, (mach_vm_address_t)dispositions,
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&chunk_pages_to_query);
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if (kr != KERN_SUCCESS)
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return dirty_pages;
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for (mach_vm_size_t i = 0; i < chunk_pages_to_query; i++) {
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uint64_t dirty_addr = chunk_page_aligned_start_addr + (i * vm_page_size);
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if (dispositions[i] & VM_PAGE_QUERY_PAGE_DIRTY)
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dirty_pages.push_back(dirty_addr);
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}
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}
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return dirty_pages;
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}
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nub_bool_t MachVMMemory::GetMemoryRegionInfo(task_t task, nub_addr_t address,
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DNBRegionInfo *region_info) {
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MachVMRegion vmRegion(task);
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if (vmRegion.GetRegionForAddress(address)) {
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region_info->addr = vmRegion.StartAddress();
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region_info->size = vmRegion.GetByteSize();
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region_info->permissions = vmRegion.GetDNBPermissions();
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region_info->dirty_pages =
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get_dirty_pages(task, vmRegion.StartAddress(), vmRegion.GetByteSize());
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} else {
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region_info->addr = address;
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region_info->size = 0;
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if (vmRegion.GetError().Success()) {
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// vmRegion.GetRegionForAddress() return false, indicating that "address"
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// wasn't in a valid region, but the "vmRegion" info was successfully
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// read from the task which means the info describes the next valid
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// region from which we can infer the size of this invalid region
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mach_vm_address_t start_addr = vmRegion.StartAddress();
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if (address < start_addr)
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region_info->size = start_addr - address;
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}
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// If we can't get any info about the size from the next region it means
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// we asked about an address that was past all mappings, so the size
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// of this region will take up all remaining address space.
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if (region_info->size == 0)
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region_info->size = INVALID_NUB_ADDRESS - region_info->addr;
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// Not readable, writeable or executable
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region_info->permissions = 0;
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}
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return true;
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}
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static uint64_t GetPhysicalMemory() {
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// This doesn't change often at all. No need to poll each time.
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static uint64_t physical_memory = 0;
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static bool calculated = false;
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if (calculated)
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return physical_memory;
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size_t len = sizeof(physical_memory);
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sysctlbyname("hw.memsize", &physical_memory, &len, NULL, 0);
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calculated = true;
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return physical_memory;
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}
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nub_bool_t MachVMMemory::GetMemoryProfile(
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DNBProfileDataScanType scanType, task_t task, struct task_basic_info ti,
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cpu_type_t cputype, nub_process_t pid, vm_statistics64_data_t &vminfo,
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uint64_t &physical_memory, uint64_t &anonymous,
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uint64_t &phys_footprint, uint64_t &memory_cap)
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{
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if (scanType & eProfileHostMemory)
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physical_memory = GetPhysicalMemory();
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if (scanType & eProfileMemory) {
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static mach_port_t localHost = mach_host_self();
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mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
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host_statistics64(localHost, HOST_VM_INFO64, (host_info64_t)&vminfo,
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&count);
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kern_return_t kr;
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mach_msg_type_number_t info_count;
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task_vm_info_data_t vm_info;
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info_count = TASK_VM_INFO_COUNT;
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kr = task_info(task, TASK_VM_INFO_PURGEABLE, (task_info_t)&vm_info, &info_count);
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if (kr == KERN_SUCCESS) {
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if (scanType & eProfileMemoryAnonymous) {
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anonymous = vm_info.internal + vm_info.compressed - vm_info.purgeable_volatile_pmap;
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}
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phys_footprint = vm_info.phys_footprint;
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}
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}
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#if defined(WITH_FBS) || defined(WITH_BKS)
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if (scanType & eProfileMemoryCap) {
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memorystatus_memlimit_properties_t memlimit_properties;
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memset(&memlimit_properties, 0, sizeof(memlimit_properties));
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if (memorystatus_control(MEMORYSTATUS_CMD_GET_MEMLIMIT_PROPERTIES, pid, 0, &memlimit_properties, sizeof(memlimit_properties)) == 0) {
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memory_cap = memlimit_properties.memlimit_active;
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}
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}
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#endif
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return true;
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}
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nub_size_t MachVMMemory::Read(task_t task, nub_addr_t address, void *data,
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nub_size_t data_count) {
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if (data == NULL || data_count == 0)
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return 0;
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nub_size_t total_bytes_read = 0;
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nub_addr_t curr_addr = address;
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uint8_t *curr_data = (uint8_t *)data;
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while (total_bytes_read < data_count) {
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mach_vm_size_t curr_size =
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MaxBytesLeftInPage(task, curr_addr, data_count - total_bytes_read);
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mach_msg_type_number_t curr_bytes_read = 0;
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vm_offset_t vm_memory = 0;
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m_err = ::mach_vm_read(task, curr_addr, curr_size, &vm_memory,
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&curr_bytes_read);
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if (DNBLogCheckLogBit(LOG_MEMORY))
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m_err.LogThreaded("::mach_vm_read ( task = 0x%4.4x, addr = 0x%8.8llx, "
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"size = %llu, data => %8.8p, dataCnt => %i )",
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task, (uint64_t)curr_addr, (uint64_t)curr_size,
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vm_memory, curr_bytes_read);
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if (m_err.Success()) {
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if (curr_bytes_read != curr_size) {
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if (DNBLogCheckLogBit(LOG_MEMORY))
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m_err.LogThreaded(
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"::mach_vm_read ( task = 0x%4.4x, addr = 0x%8.8llx, size = %llu, "
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"data => %8.8p, dataCnt=>%i ) only read %u of %llu bytes",
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task, (uint64_t)curr_addr, (uint64_t)curr_size, vm_memory,
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curr_bytes_read, curr_bytes_read, (uint64_t)curr_size);
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}
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::memcpy(curr_data, (void *)vm_memory, curr_bytes_read);
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::vm_deallocate(mach_task_self(), vm_memory, curr_bytes_read);
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total_bytes_read += curr_bytes_read;
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curr_addr += curr_bytes_read;
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curr_data += curr_bytes_read;
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} else {
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break;
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}
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}
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return total_bytes_read;
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}
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nub_size_t MachVMMemory::Write(task_t task, nub_addr_t address,
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const void *data, nub_size_t data_count) {
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MachVMRegion vmRegion(task);
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nub_size_t total_bytes_written = 0;
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nub_addr_t curr_addr = address;
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const uint8_t *curr_data = (const uint8_t *)data;
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while (total_bytes_written < data_count) {
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if (vmRegion.GetRegionForAddress(curr_addr)) {
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mach_vm_size_t curr_data_count = data_count - total_bytes_written;
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mach_vm_size_t region_bytes_left = vmRegion.BytesRemaining(curr_addr);
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if (region_bytes_left == 0) {
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break;
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}
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if (curr_data_count > region_bytes_left)
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curr_data_count = region_bytes_left;
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if (vmRegion.SetProtections(curr_addr, curr_data_count,
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VM_PROT_READ | VM_PROT_WRITE)) {
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nub_size_t bytes_written =
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WriteRegion(task, curr_addr, curr_data, curr_data_count);
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if (bytes_written <= 0) {
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// Status should have already be posted by WriteRegion...
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break;
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} else {
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total_bytes_written += bytes_written;
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curr_addr += bytes_written;
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curr_data += bytes_written;
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}
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} else {
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DNBLogThreadedIf(
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LOG_MEMORY_PROTECTIONS, "Failed to set read/write protections on "
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"region for address: [0x%8.8llx-0x%8.8llx)",
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(uint64_t)curr_addr, (uint64_t)(curr_addr + curr_data_count));
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break;
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}
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} else {
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DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS,
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"Failed to get region for address: 0x%8.8llx",
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(uint64_t)address);
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break;
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}
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}
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return total_bytes_written;
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}
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nub_size_t MachVMMemory::WriteRegion(task_t task, const nub_addr_t address,
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const void *data,
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const nub_size_t data_count) {
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if (data == NULL || data_count == 0)
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return 0;
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nub_size_t total_bytes_written = 0;
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nub_addr_t curr_addr = address;
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const uint8_t *curr_data = (const uint8_t *)data;
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while (total_bytes_written < data_count) {
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mach_msg_type_number_t curr_data_count =
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static_cast<mach_msg_type_number_t>(MaxBytesLeftInPage(
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task, curr_addr, data_count - total_bytes_written));
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m_err =
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::mach_vm_write(task, curr_addr, (pointer_t)curr_data, curr_data_count);
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if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail())
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m_err.LogThreaded("::mach_vm_write ( task = 0x%4.4x, addr = 0x%8.8llx, "
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"data = %8.8p, dataCnt = %u )",
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task, (uint64_t)curr_addr, curr_data, curr_data_count);
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#if !defined(__i386__) && !defined(__x86_64__)
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vm_machine_attribute_val_t mattr_value = MATTR_VAL_CACHE_FLUSH;
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m_err = ::vm_machine_attribute(task, curr_addr, curr_data_count,
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MATTR_CACHE, &mattr_value);
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if (DNBLogCheckLogBit(LOG_MEMORY) || m_err.Fail())
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m_err.LogThreaded("::vm_machine_attribute ( task = 0x%4.4x, addr = "
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"0x%8.8llx, size = %u, attr = MATTR_CACHE, mattr_value "
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"=> MATTR_VAL_CACHE_FLUSH )",
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task, (uint64_t)curr_addr, curr_data_count);
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#endif
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if (m_err.Success()) {
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total_bytes_written += curr_data_count;
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curr_addr += curr_data_count;
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curr_data += curr_data_count;
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} else {
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break;
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}
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}
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return total_bytes_written;
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}
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