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119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
//===-- DynamicLoaderWindowsDYLD.cpp --------------------------------*- C++
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//-*-===//
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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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#include "DynamicLoaderWindowsDYLD.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/ThreadPlanStepInstruction.h"
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#include "llvm/ADT/Triple.h"
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using namespace lldb;
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using namespace lldb_private;
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DynamicLoaderWindowsDYLD::DynamicLoaderWindowsDYLD(Process *process)
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: DynamicLoader(process) {}
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DynamicLoaderWindowsDYLD::~DynamicLoaderWindowsDYLD() {}
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void DynamicLoaderWindowsDYLD::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance);
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}
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void DynamicLoaderWindowsDYLD::Terminate() {}
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ConstString DynamicLoaderWindowsDYLD::GetPluginNameStatic() {
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static ConstString g_plugin_name("windows-dyld");
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return g_plugin_name;
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}
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const char *DynamicLoaderWindowsDYLD::GetPluginDescriptionStatic() {
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return "Dynamic loader plug-in that watches for shared library "
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"loads/unloads in Windows processes.";
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}
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DynamicLoader *DynamicLoaderWindowsDYLD::CreateInstance(Process *process,
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bool force) {
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bool should_create = force;
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if (!should_create) {
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const llvm::Triple &triple_ref =
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process->GetTarget().GetArchitecture().GetTriple();
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if (triple_ref.getOS() == llvm::Triple::Win32)
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should_create = true;
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}
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if (should_create)
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return new DynamicLoaderWindowsDYLD(process);
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return nullptr;
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}
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void DynamicLoaderWindowsDYLD::DidAttach() {}
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void DynamicLoaderWindowsDYLD::DidLaunch() {}
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Status DynamicLoaderWindowsDYLD::CanLoadImage() { return Status(); }
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ConstString DynamicLoaderWindowsDYLD::GetPluginName() {
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return GetPluginNameStatic();
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}
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uint32_t DynamicLoaderWindowsDYLD::GetPluginVersion() { return 1; }
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ThreadPlanSP
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DynamicLoaderWindowsDYLD::GetStepThroughTrampolinePlan(Thread &thread,
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bool stop) {
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auto arch = m_process->GetTarget().GetArchitecture();
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if (arch.GetMachine() != llvm::Triple::x86) {
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return ThreadPlanSP();
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}
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uint64_t pc = thread.GetRegisterContext()->GetPC();
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// Max size of an instruction in x86 is 15 bytes.
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AddressRange range(pc, 2 * 15);
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ExecutionContext exe_ctx(m_process->GetTarget());
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DisassemblerSP disassembler_sp = Disassembler::DisassembleRange(
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arch, nullptr, nullptr, exe_ctx, range, true);
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if (!disassembler_sp) {
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return ThreadPlanSP();
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}
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InstructionList *insn_list = &disassembler_sp->GetInstructionList();
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if (insn_list == nullptr) {
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return ThreadPlanSP();
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}
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// First instruction in a x86 Windows trampoline is going to be an indirect
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// jump through the IAT and the next one will be a nop (usually there for
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// alignment purposes). e.g.:
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// 0x70ff4cfc <+956>: jmpl *0x7100c2a8
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// 0x70ff4d02 <+962>: nop
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auto first_insn = insn_list->GetInstructionAtIndex(0);
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auto second_insn = insn_list->GetInstructionAtIndex(1);
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if (first_insn == nullptr || second_insn == nullptr ||
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strcmp(first_insn->GetMnemonic(&exe_ctx), "jmpl") != 0 ||
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strcmp(second_insn->GetMnemonic(&exe_ctx), "nop") != 0) {
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return ThreadPlanSP();
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}
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assert(first_insn->DoesBranch() && !second_insn->DoesBranch());
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return ThreadPlanSP(new ThreadPlanStepInstruction(
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thread, false, false, eVoteNoOpinion, eVoteNoOpinion));
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}
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