2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
185 lines
7.0 KiB
C++
185 lines
7.0 KiB
C++
//===-- MachVMRegion.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 "MachVMRegion.h"
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#include "DNBLog.h"
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#include <assert.h>
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#include <mach/mach_vm.h>
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MachVMRegion::MachVMRegion(task_t task)
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: m_task(task), m_addr(INVALID_NUB_ADDRESS), m_err(),
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m_start(INVALID_NUB_ADDRESS), m_size(0), m_depth(-1),
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m_curr_protection(0), m_protection_addr(INVALID_NUB_ADDRESS),
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m_protection_size(0) {
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memset(&m_data, 0, sizeof(m_data));
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}
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MachVMRegion::~MachVMRegion() {
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// Restore any original protections and clear our vars
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Clear();
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}
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void MachVMRegion::Clear() {
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RestoreProtections();
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m_addr = INVALID_NUB_ADDRESS;
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m_err.Clear();
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m_start = INVALID_NUB_ADDRESS;
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m_size = 0;
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m_depth = -1;
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memset(&m_data, 0, sizeof(m_data));
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m_curr_protection = 0;
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m_protection_addr = INVALID_NUB_ADDRESS;
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m_protection_size = 0;
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}
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bool MachVMRegion::SetProtections(mach_vm_address_t addr, mach_vm_size_t size,
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vm_prot_t prot) {
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if (ContainsAddress(addr)) {
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mach_vm_size_t prot_size = size;
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mach_vm_address_t end_addr = EndAddress();
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if (prot_size > (end_addr - addr))
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prot_size = end_addr - addr;
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if (prot_size > 0) {
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if (prot == (m_curr_protection & VM_PROT_ALL)) {
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DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS | LOG_VERBOSE,
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"MachVMRegion::%s: protections (%u) already "
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"sufficient for task 0x%4.4x at address 0x%8.8llx) ",
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__FUNCTION__, prot, m_task, (uint64_t)addr);
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// Protections are already set as requested...
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return true;
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} else {
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m_err = ::mach_vm_protect(m_task, addr, prot_size, 0, prot);
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if (DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS))
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m_err.LogThreaded("::mach_vm_protect ( task = 0x%4.4x, addr = "
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"0x%8.8llx, size = %llu, set_max = %i, prot = %u )",
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m_task, (uint64_t)addr, (uint64_t)prot_size, 0,
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prot);
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if (m_err.Fail()) {
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// Try again with the ability to create a copy on write region
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m_err = ::mach_vm_protect(m_task, addr, prot_size, 0,
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prot | VM_PROT_COPY);
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if (DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS) || m_err.Fail())
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m_err.LogThreaded("::mach_vm_protect ( task = 0x%4.4x, addr = "
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"0x%8.8llx, size = %llu, set_max = %i, prot = %u "
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")",
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m_task, (uint64_t)addr, (uint64_t)prot_size, 0,
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prot | VM_PROT_COPY);
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}
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if (m_err.Success()) {
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m_curr_protection = prot;
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m_protection_addr = addr;
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m_protection_size = prot_size;
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return true;
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}
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}
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} else {
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DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS | LOG_VERBOSE,
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"%s: Zero size for task 0x%4.4x at address 0x%8.8llx) ",
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__FUNCTION__, m_task, (uint64_t)addr);
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}
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}
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return false;
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}
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bool MachVMRegion::RestoreProtections() {
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if (m_curr_protection != m_data.protection && m_protection_size > 0) {
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m_err = ::mach_vm_protect(m_task, m_protection_addr, m_protection_size, 0,
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m_data.protection);
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if (DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS) || m_err.Fail())
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m_err.LogThreaded("::mach_vm_protect ( task = 0x%4.4x, addr = 0x%8.8llx, "
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"size = %llu, set_max = %i, prot = %u )",
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m_task, (uint64_t)m_protection_addr,
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(uint64_t)m_protection_size, 0, m_data.protection);
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if (m_err.Success()) {
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m_protection_size = 0;
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m_protection_addr = INVALID_NUB_ADDRESS;
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m_curr_protection = m_data.protection;
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return true;
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}
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} else {
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m_err.Clear();
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return true;
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}
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return false;
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}
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bool MachVMRegion::GetRegionForAddress(nub_addr_t addr) {
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// Restore any original protections and clear our vars
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Clear();
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m_err.Clear();
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m_addr = addr;
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m_start = addr;
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m_depth = 1024;
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mach_msg_type_number_t info_size = kRegionInfoSize;
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assert(sizeof(info_size) == 4);
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m_err =
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::mach_vm_region_recurse(m_task, &m_start, &m_size, &m_depth,
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(vm_region_recurse_info_t)&m_data, &info_size);
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const bool failed = m_err.Fail();
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const bool log_protections = DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS);
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if (log_protections || failed)
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m_err.LogThreaded("::mach_vm_region_recurse ( task = 0x%4.4x, address => "
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"0x%8.8llx, size => %llu, nesting_depth => %d, info => "
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"%p, infoCnt => %d) addr = 0x%8.8llx ",
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m_task, (uint64_t)m_start, (uint64_t)m_size, m_depth,
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&m_data, info_size, (uint64_t)addr);
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if (failed)
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return false;
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if (log_protections) {
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DNBLogThreaded("info = { prot = %u, "
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"max_prot = %u, "
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"inheritance = 0x%8.8x, "
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"offset = 0x%8.8llx, "
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"user_tag = 0x%8.8x, "
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"ref_count = %u, "
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"shadow_depth = %u, "
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"ext_pager = %u, "
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"share_mode = %u, "
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"is_submap = %d, "
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"behavior = %d, "
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"object_id = 0x%8.8x, "
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"user_wired_count = 0x%4.4x }",
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m_data.protection, m_data.max_protection, m_data.inheritance,
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(uint64_t)m_data.offset, m_data.user_tag, m_data.ref_count,
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m_data.shadow_depth, m_data.external_pager,
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m_data.share_mode, m_data.is_submap, m_data.behavior,
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m_data.object_id, m_data.user_wired_count);
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}
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m_curr_protection = m_data.protection;
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// We make a request for an address and got no error back, but this
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// doesn't mean that "addr" is in the range. The data in this object will
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// be valid though, so you could see where the next region begins. So we
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// return false, yet leave "m_err" with a successfull return code.
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return !((addr < m_start) || (addr >= (m_start + m_size)));
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}
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uint32_t MachVMRegion::GetDNBPermissions() const {
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if (m_addr == INVALID_NUB_ADDRESS || m_start == INVALID_NUB_ADDRESS ||
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m_size == 0)
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return 0;
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uint32_t dnb_permissions = 0;
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if ((m_data.protection & VM_PROT_READ) == VM_PROT_READ)
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dnb_permissions |= eMemoryPermissionsReadable;
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if ((m_data.protection & VM_PROT_WRITE) == VM_PROT_WRITE)
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dnb_permissions |= eMemoryPermissionsWritable;
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if ((m_data.protection & VM_PROT_EXECUTE) == VM_PROT_EXECUTE)
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dnb_permissions |= eMemoryPermissionsExecutable;
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return dnb_permissions;
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}
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