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369 lines
10 KiB
369 lines
10 KiB
//===-- HexagonDYLDRendezvous.cpp -----------------------------------------===//
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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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#include "lldb/Core/Module.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "HexagonDYLDRendezvous.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 ResolveRendezvousAddress(Process *process) {
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addr_t info_location;
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addr_t info_addr;
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Status error;
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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 = process->ReadPointerFromMemory(info_location, error);
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if (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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HexagonDYLDRendezvous::HexagonDYLDRendezvous(Process *process)
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: m_process(process), m_rendezvous_addr(LLDB_INVALID_ADDRESS), m_current(),
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m_previous(), m_soentries(), m_added_soentries(), m_removed_soentries() {
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m_thread_info.valid = false;
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// Cache a copy of the executable path
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if (m_process) {
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Module *exe_mod = m_process->GetTarget().GetExecutableModulePointer();
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if (exe_mod)
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exe_mod->GetFileSpec().GetPath(m_exe_path, PATH_MAX);
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}
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}
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bool HexagonDYLDRendezvous::Resolve() {
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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 = ReadWord(cursor, &info.version, word_size)))
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return false;
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if (!(cursor = ReadPointer(cursor + padding, &info.map_addr)))
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return false;
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if (!(cursor = ReadPointer(cursor, &info.brk)))
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return false;
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if (!(cursor = ReadWord(cursor, &info.state, word_size)))
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return false;
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if (!(cursor = ReadPointer(cursor + padding, &info.ldbase)))
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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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void HexagonDYLDRendezvous::SetRendezvousAddress(lldb::addr_t addr) {
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m_rendezvous_addr = addr;
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}
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bool HexagonDYLDRendezvous::IsValid() {
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return m_rendezvous_addr != LLDB_INVALID_ADDRESS;
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}
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bool HexagonDYLDRendezvous::UpdateSOEntries() {
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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 time
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// 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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// this is a fudge so that we can clear the assert below.
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m_previous.state = eConsistent;
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// We hit this assert on the 2nd run of this function after running the
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// calc example
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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 HexagonDYLDRendezvous::UpdateSOEntriesForAddition() {
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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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if (!ReadSOEntryFromMemory(cursor, entry))
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return false;
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// Only add shared libraries and not the executable. On Linux this is
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// indicated by an empty path in the entry. On FreeBSD it is the name of
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// 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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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 HexagonDYLDRendezvous::UpdateSOEntriesForDeletion() {
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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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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 HexagonDYLDRendezvous::TakeSnapshot(SOEntryList &entry_list) {
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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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if (!ReadSOEntryFromMemory(cursor, entry))
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return false;
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// Only add shared libraries and not the executable. On Linux this is
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// indicated by an empty path in the entry. On FreeBSD it is the name of
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// 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 HexagonDYLDRendezvous::ReadWord(addr_t addr, uint64_t *dst,
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size_t size) {
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Status error;
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*dst = m_process->ReadUnsignedIntegerFromMemory(addr, size, 0, error);
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if (error.Fail())
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return 0;
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return addr + size;
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}
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addr_t HexagonDYLDRendezvous::ReadPointer(addr_t addr, addr_t *dst) {
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Status error;
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*dst = m_process->ReadPointerFromMemory(addr, error);
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if (error.Fail())
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return 0;
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return addr + m_process->GetAddressByteSize();
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}
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std::string HexagonDYLDRendezvous::ReadStringFromMemory(addr_t addr) {
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std::string str;
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Status 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 HexagonDYLDRendezvous::ReadSOEntryFromMemory(lldb::addr_t addr,
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SOEntry &entry) {
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entry.clear();
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entry.link_addr = addr;
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if (!(addr = ReadPointer(addr, &entry.base_addr)))
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return false;
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if (!(addr = ReadPointer(addr, &entry.path_addr)))
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return false;
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if (!(addr = ReadPointer(addr, &entry.dyn_addr)))
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return false;
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if (!(addr = ReadPointer(addr, &entry.next)))
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return false;
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if (!(addr = ReadPointer(addr, &entry.prev)))
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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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bool HexagonDYLDRendezvous::FindMetadata(const char *name, PThreadField field,
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uint32_t &value) {
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Target &target = m_process->GetTarget();
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SymbolContextList list;
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target.GetImages().FindSymbolsWithNameAndType(ConstString(name),
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eSymbolTypeAny, list);
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if (list.IsEmpty())
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return false;
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Address address = list[0].symbol->GetAddress();
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addr_t addr = address.GetLoadAddress(&target);
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if (addr == LLDB_INVALID_ADDRESS)
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return false;
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Status error;
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value = (uint32_t)m_process->ReadUnsignedIntegerFromMemory(
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addr + field * sizeof(uint32_t), sizeof(uint32_t), 0, error);
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if (error.Fail())
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return false;
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if (field == eSize)
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value /= 8; // convert bits to bytes
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return true;
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}
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const HexagonDYLDRendezvous::ThreadInfo &
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HexagonDYLDRendezvous::GetThreadInfo() {
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if (!m_thread_info.valid) {
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bool ok = true;
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ok &= FindMetadata("_thread_db_pthread_dtvp", eOffset,
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m_thread_info.dtv_offset);
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ok &=
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FindMetadata("_thread_db_dtv_dtv", eSize, m_thread_info.dtv_slot_size);
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ok &= FindMetadata("_thread_db_link_map_l_tls_modid", eOffset,
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m_thread_info.modid_offset);
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ok &= FindMetadata("_thread_db_dtv_t_pointer_val", eOffset,
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m_thread_info.tls_offset);
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if (ok)
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m_thread_info.valid = true;
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}
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return m_thread_info;
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}
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void HexagonDYLDRendezvous::DumpToLog(Log *log) const {
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int state = GetState();
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if (!log)
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return;
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log->PutCString("HexagonDYLDRendezvous:");
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LLDB_LOGF(log, " Address: %" PRIx64, GetRendezvousAddress());
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LLDB_LOGF(log, " Version: %" PRIu64, GetVersion());
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LLDB_LOGF(log, " Link : %" PRIx64, GetLinkMapAddress());
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LLDB_LOGF(log, " Break : %" PRIx64, GetBreakAddress());
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LLDB_LOGF(log, " LDBase : %" PRIx64, GetLDBase());
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LLDB_LOGF(log, " State : %s",
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(state == eConsistent)
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? "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("HexagonDYLDRendezvous SOEntries:");
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for (int i = 1; I != E; ++I, ++i) {
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LLDB_LOGF(log, "\n SOEntry [%d] %s", i, I->path.c_str());
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LLDB_LOGF(log, " Base : %" PRIx64, I->base_addr);
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LLDB_LOGF(log, " Path : %" PRIx64, I->path_addr);
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LLDB_LOGF(log, " Dyn : %" PRIx64, I->dyn_addr);
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LLDB_LOGF(log, " Next : %" PRIx64, I->next);
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LLDB_LOGF(log, " Prev : %" PRIx64, I->prev);
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}
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}
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