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//===-- DynamicLoaderWindowsDYLD.cpp --------------------------------*- C++
//-*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DynamicLoaderWindowsDYLD.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/ThreadPlanStepInstruction.h"
#include "lldb/Utility/Log.h"
#include "llvm/ADT/Triple.h"
using namespace lldb;
using namespace lldb_private;
DynamicLoaderWindowsDYLD::DynamicLoaderWindowsDYLD(Process *process)
: DynamicLoader(process) {}
DynamicLoaderWindowsDYLD::~DynamicLoaderWindowsDYLD() {}
void DynamicLoaderWindowsDYLD::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance);
}
void DynamicLoaderWindowsDYLD::Terminate() {}
ConstString DynamicLoaderWindowsDYLD::GetPluginNameStatic() {
static ConstString g_plugin_name("windows-dyld");
return g_plugin_name;
}
const char *DynamicLoaderWindowsDYLD::GetPluginDescriptionStatic() {
return "Dynamic loader plug-in that watches for shared library "
"loads/unloads in Windows processes.";
}
DynamicLoader *DynamicLoaderWindowsDYLD::CreateInstance(Process *process,
bool force) {
bool should_create = force;
if (!should_create) {
const llvm::Triple &triple_ref =
process->GetTarget().GetArchitecture().GetTriple();
if (triple_ref.getOS() == llvm::Triple::Win32)
should_create = true;
}
if (should_create)
return new DynamicLoaderWindowsDYLD(process);
return nullptr;
}
void DynamicLoaderWindowsDYLD::DidAttach() {
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (log)
log->Printf("DynamicLoaderWindowsDYLD::%s()", __FUNCTION__);
ModuleSP executable = GetTargetExecutable();
if (!executable.get())
return;
// Try to fetch the load address of the file from the process, since there
// could be randomization of the load address.
// It might happen that the remote has a different dir for the file, so we
// only send the basename of the executable in the query. I think this is safe
// because I doubt that two executables with the same basenames are loaded in
// memory...
FileSpec file_spec(
executable->GetPlatformFileSpec().GetFilename().GetCString());
bool is_loaded;
addr_t base_addr = 0;
lldb::addr_t load_addr;
Status error = m_process->GetFileLoadAddress(file_spec, is_loaded, load_addr);
if (error.Success() && is_loaded) {
base_addr = load_addr;
UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, base_addr, false);
}
ModuleList module_list;
module_list.Append(executable);
m_process->GetTarget().ModulesDidLoad(module_list);
m_process->LoadModules();
}
void DynamicLoaderWindowsDYLD::DidLaunch() {}
Status DynamicLoaderWindowsDYLD::CanLoadImage() { return Status(); }
ConstString DynamicLoaderWindowsDYLD::GetPluginName() {
return GetPluginNameStatic();
}
uint32_t DynamicLoaderWindowsDYLD::GetPluginVersion() { return 1; }
ThreadPlanSP
DynamicLoaderWindowsDYLD::GetStepThroughTrampolinePlan(Thread &thread,
bool stop) {
auto arch = m_process->GetTarget().GetArchitecture();
if (arch.GetMachine() != llvm::Triple::x86) {
return ThreadPlanSP();
}
uint64_t pc = thread.GetRegisterContext()->GetPC();
// Max size of an instruction in x86 is 15 bytes.
AddressRange range(pc, 2 * 15);
ExecutionContext exe_ctx(m_process->GetTarget());
DisassemblerSP disassembler_sp = Disassembler::DisassembleRange(
arch, nullptr, nullptr, exe_ctx, range, true);
if (!disassembler_sp) {
return ThreadPlanSP();
}
InstructionList *insn_list = &disassembler_sp->GetInstructionList();
if (insn_list == nullptr) {
return ThreadPlanSP();
}
// First instruction in a x86 Windows trampoline is going to be an indirect
// jump through the IAT and the next one will be a nop (usually there for
// alignment purposes). e.g.:
// 0x70ff4cfc <+956>: jmpl *0x7100c2a8
// 0x70ff4d02 <+962>: nop
auto first_insn = insn_list->GetInstructionAtIndex(0);
auto second_insn = insn_list->GetInstructionAtIndex(1);
if (first_insn == nullptr || second_insn == nullptr ||
strcmp(first_insn->GetMnemonic(&exe_ctx), "jmpl") != 0 ||
strcmp(second_insn->GetMnemonic(&exe_ctx), "nop") != 0) {
return ThreadPlanSP();
}
assert(first_insn->DoesBranch() && !second_insn->DoesBranch());
return ThreadPlanSP(new ThreadPlanStepInstruction(
thread, false, false, eVoteNoOpinion, eVoteNoOpinion));
}
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