forked from OSchip/llvm-project
332 lines
8.7 KiB
C++
332 lines
8.7 KiB
C++
//===-- DYLDRendezvous.cpp --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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#include "lldb/Core/ArchSpec.h"
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#include "lldb/Core/Error.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "DYLDRendezvous.h"
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using namespace lldb;
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using namespace lldb_private;
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/// Locates the address of the rendezvous structure. Returns the address on
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/// success and LLDB_INVALID_ADDRESS on failure.
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static addr_t
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ResolveRendezvousAddress(Process *process)
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{
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addr_t info_location;
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addr_t info_addr;
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Error error;
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size_t size;
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info_location = process->GetImageInfoAddress();
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if (info_location == LLDB_INVALID_ADDRESS)
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return LLDB_INVALID_ADDRESS;
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info_addr = 0;
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size = process->DoReadMemory(info_location, &info_addr,
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process->GetAddressByteSize(), error);
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if (size != process->GetAddressByteSize() || error.Fail())
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return LLDB_INVALID_ADDRESS;
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if (info_addr == 0)
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return LLDB_INVALID_ADDRESS;
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return info_addr;
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}
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DYLDRendezvous::DYLDRendezvous(Process *process)
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: m_process(process),
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m_rendezvous_addr(LLDB_INVALID_ADDRESS),
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m_current(),
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m_previous(),
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m_soentries(),
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m_added_soentries(),
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m_removed_soentries()
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{
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// Cache a copy of the executable path
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m_process->GetTarget().GetExecutableModule().get()->GetFileSpec().GetPath(m_exe_path, PATH_MAX);
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}
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bool
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DYLDRendezvous::Resolve()
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{
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const size_t word_size = 4;
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Rendezvous info;
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size_t address_size;
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size_t padding;
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addr_t info_addr;
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addr_t cursor;
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address_size = m_process->GetAddressByteSize();
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padding = address_size - word_size;
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if (m_rendezvous_addr == LLDB_INVALID_ADDRESS)
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cursor = info_addr = ResolveRendezvousAddress(m_process);
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else
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cursor = info_addr = m_rendezvous_addr;
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if (cursor == LLDB_INVALID_ADDRESS)
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return false;
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if (!(cursor = ReadMemory(cursor, &info.version, word_size)))
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return false;
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if (!(cursor = ReadMemory(cursor + padding, &info.map_addr, address_size)))
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return false;
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if (!(cursor = ReadMemory(cursor, &info.brk, address_size)))
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return false;
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if (!(cursor = ReadMemory(cursor, &info.state, word_size)))
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return false;
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if (!(cursor = ReadMemory(cursor + padding, &info.ldbase, address_size)))
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return false;
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// The rendezvous was successfully read. Update our internal state.
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m_rendezvous_addr = info_addr;
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m_previous = m_current;
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m_current = info;
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return UpdateSOEntries();
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}
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bool
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DYLDRendezvous::IsValid()
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{
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return m_rendezvous_addr != LLDB_INVALID_ADDRESS;
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}
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bool
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DYLDRendezvous::UpdateSOEntries()
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{
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SOEntry entry;
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if (m_current.map_addr == 0)
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return false;
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// When the previous and current states are consistent this is the first
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// time we have been asked to update. Just take a snapshot of the currently
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// loaded modules.
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if (m_previous.state == eConsistent && m_current.state == eConsistent)
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return TakeSnapshot(m_soentries);
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// If we are about to add or remove a shared object clear out the current
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// state and take a snapshot of the currently loaded images.
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if (m_current.state == eAdd || m_current.state == eDelete)
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{
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assert(m_previous.state == eConsistent);
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m_soentries.clear();
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m_added_soentries.clear();
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m_removed_soentries.clear();
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return TakeSnapshot(m_soentries);
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}
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assert(m_current.state == eConsistent);
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// Otherwise check the previous state to determine what to expect and update
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// accordingly.
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if (m_previous.state == eAdd)
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return UpdateSOEntriesForAddition();
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else if (m_previous.state == eDelete)
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return UpdateSOEntriesForDeletion();
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return false;
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}
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bool
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DYLDRendezvous::UpdateSOEntriesForAddition()
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{
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SOEntry entry;
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iterator pos;
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assert(m_previous.state == eAdd);
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if (m_current.map_addr == 0)
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return false;
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for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next)
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{
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if (!ReadSOEntryFromMemory(cursor, entry))
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return false;
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// Only add shared libraries and not the executable.
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// On Linux this is indicated by an empty path in the entry.
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// On FreeBSD it is the name of the executable.
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if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0)
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continue;
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pos = std::find(m_soentries.begin(), m_soentries.end(), entry);
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if (pos == m_soentries.end())
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{
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m_soentries.push_back(entry);
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m_added_soentries.push_back(entry);
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}
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}
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return true;
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}
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bool
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DYLDRendezvous::UpdateSOEntriesForDeletion()
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{
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SOEntryList entry_list;
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iterator pos;
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assert(m_previous.state == eDelete);
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if (!TakeSnapshot(entry_list))
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return false;
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for (iterator I = begin(); I != end(); ++I)
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{
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pos = std::find(entry_list.begin(), entry_list.end(), *I);
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if (pos == entry_list.end())
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m_removed_soentries.push_back(*I);
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}
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m_soentries = entry_list;
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return true;
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}
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bool
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DYLDRendezvous::TakeSnapshot(SOEntryList &entry_list)
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{
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SOEntry entry;
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if (m_current.map_addr == 0)
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return false;
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for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next)
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{
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if (!ReadSOEntryFromMemory(cursor, entry))
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return false;
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// Only add shared libraries and not the executable.
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// On Linux this is indicated by an empty path in the entry.
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// On FreeBSD it is the name of the executable.
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if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0)
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continue;
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entry_list.push_back(entry);
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}
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return true;
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}
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addr_t
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DYLDRendezvous::ReadMemory(addr_t addr, void *dst, size_t size)
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{
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size_t bytes_read;
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Error error;
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bytes_read = m_process->DoReadMemory(addr, dst, size, error);
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if (bytes_read != size || error.Fail())
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return 0;
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return addr + bytes_read;
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}
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std::string
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DYLDRendezvous::ReadStringFromMemory(addr_t addr)
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{
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std::string str;
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Error error;
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size_t size;
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char c;
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if (addr == LLDB_INVALID_ADDRESS)
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return std::string();
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for (;;) {
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size = m_process->DoReadMemory(addr, &c, 1, error);
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if (size != 1 || error.Fail())
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return std::string();
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if (c == 0)
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break;
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else {
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str.push_back(c);
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addr++;
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}
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}
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return str;
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}
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bool
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DYLDRendezvous::ReadSOEntryFromMemory(lldb::addr_t addr, SOEntry &entry)
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{
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size_t address_size = m_process->GetAddressByteSize();
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entry.clear();
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if (!(addr = ReadMemory(addr, &entry.base_addr, address_size)))
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return false;
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if (!(addr = ReadMemory(addr, &entry.path_addr, address_size)))
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return false;
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if (!(addr = ReadMemory(addr, &entry.dyn_addr, address_size)))
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return false;
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if (!(addr = ReadMemory(addr, &entry.next, address_size)))
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return false;
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if (!(addr = ReadMemory(addr, &entry.prev, address_size)))
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return false;
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entry.path = ReadStringFromMemory(entry.path_addr);
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return true;
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}
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void
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DYLDRendezvous::DumpToLog(LogSP log) const
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{
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int state = GetState();
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if (!log)
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return;
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log->PutCString("DYLDRendezvous:");
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log->Printf(" Address: %" PRIx64, GetRendezvousAddress());
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log->Printf(" Version: %d", GetVersion());
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log->Printf(" Link : %" PRIx64, GetLinkMapAddress());
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log->Printf(" Break : %" PRIx64, GetBreakAddress());
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log->Printf(" LDBase : %" PRIx64, GetLDBase());
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log->Printf(" State : %s",
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(state == eConsistent) ? "consistent" :
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(state == eAdd) ? "add" :
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(state == eDelete) ? "delete" : "unknown");
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iterator I = begin();
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iterator E = end();
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if (I != E)
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log->PutCString("DYLDRendezvous SOEntries:");
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for (int i = 1; I != E; ++I, ++i)
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{
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log->Printf("\n SOEntry [%d] %s", i, I->path.c_str());
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log->Printf(" Base : %" PRIx64, I->base_addr);
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log->Printf(" Path : %" PRIx64, I->path_addr);
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log->Printf(" Dyn : %" PRIx64, I->dyn_addr);
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log->Printf(" Next : %" PRIx64, I->next);
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log->Printf(" Prev : %" PRIx64, I->prev);
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}
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}
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