1 //===-- DynamicLoaderStatic.cpp -------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "lldb/Core/Module.h"
10 #include "lldb/Core/PluginManager.h"
11 #include "lldb/Core/Section.h"
12 #include "lldb/Symbol/ObjectFile.h"
13 #include "lldb/Target/SectionLoadList.h"
14 #include "lldb/Target/Target.h"
15
16 #include "DynamicLoaderStatic.h"
17
18 using namespace lldb;
19 using namespace lldb_private;
20
LLDB_PLUGIN_DEFINE(DynamicLoaderStatic)21 LLDB_PLUGIN_DEFINE(DynamicLoaderStatic)
22
23 // Create an instance of this class. This function is filled into the plugin
24 // info class that gets handed out by the plugin factory and allows the lldb to
25 // instantiate an instance of this class.
26 DynamicLoader *DynamicLoaderStatic::CreateInstance(Process *process,
27 bool force) {
28 bool create = force;
29 if (!create) {
30 const llvm::Triple &triple_ref =
31 process->GetTarget().GetArchitecture().GetTriple();
32 const llvm::Triple::OSType os_type = triple_ref.getOS();
33 const llvm::Triple::ArchType arch_type = triple_ref.getArch();
34 if (os_type == llvm::Triple::UnknownOS) {
35 // The WASM and Hexagon plugin check the ArchType rather than the OSType,
36 // so explicitly reject those here.
37 switch(arch_type) {
38 case llvm::Triple::hexagon:
39 case llvm::Triple::wasm32:
40 case llvm::Triple::wasm64:
41 break;
42 default:
43 create = true;
44 }
45 }
46 }
47
48 if (!create) {
49 Module *exe_module = process->GetTarget().GetExecutableModulePointer();
50 if (exe_module) {
51 ObjectFile *object_file = exe_module->GetObjectFile();
52 if (object_file) {
53 create = (object_file->GetStrata() == ObjectFile::eStrataRawImage);
54 }
55 }
56 }
57
58 if (create)
59 return new DynamicLoaderStatic(process);
60 return nullptr;
61 }
62
63 // Constructor
DynamicLoaderStatic(Process * process)64 DynamicLoaderStatic::DynamicLoaderStatic(Process *process)
65 : DynamicLoader(process) {}
66
67 /// Called after attaching a process.
68 ///
69 /// Allow DynamicLoader plug-ins to execute some code after
70 /// attaching to a process.
DidAttach()71 void DynamicLoaderStatic::DidAttach() { LoadAllImagesAtFileAddresses(); }
72
73 /// Called after attaching a process.
74 ///
75 /// Allow DynamicLoader plug-ins to execute some code after
76 /// attaching to a process.
DidLaunch()77 void DynamicLoaderStatic::DidLaunch() { LoadAllImagesAtFileAddresses(); }
78
LoadAllImagesAtFileAddresses()79 void DynamicLoaderStatic::LoadAllImagesAtFileAddresses() {
80 const ModuleList &module_list = m_process->GetTarget().GetImages();
81
82 ModuleList loaded_module_list;
83
84 // Disable JIT for static dynamic loader targets
85 m_process->SetCanJIT(false);
86
87 Target &target = m_process->GetTarget();
88 for (ModuleSP module_sp : module_list.Modules()) {
89 if (module_sp) {
90 bool changed = false;
91 bool no_load_addresses = true;
92 // If this module has a section with a load address set in
93 // the target, assume all necessary work is already done. There
94 // may be sections without a load address set intentionally
95 // and we don't want to mutate that.
96 // For a module with no load addresses set, set the load addresses
97 // to slide == 0, the same as the file addresses, in the target.
98 ObjectFile *image_object_file = module_sp->GetObjectFile();
99 if (image_object_file) {
100 SectionList *section_list = image_object_file->GetSectionList();
101 if (section_list) {
102 const size_t num_sections = section_list->GetSize();
103 for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
104 SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
105 if (section_sp) {
106 if (target.GetSectionLoadList().GetSectionLoadAddress(
107 section_sp) != LLDB_INVALID_ADDRESS) {
108 no_load_addresses = false;
109 break;
110 }
111 }
112 }
113 }
114 }
115 if (no_load_addresses)
116 module_sp->SetLoadAddress(target, 0, true /*value_is_offset*/, changed);
117
118 if (changed)
119 loaded_module_list.AppendIfNeeded(module_sp);
120 }
121 }
122
123 target.ModulesDidLoad(loaded_module_list);
124 }
125
126 ThreadPlanSP
GetStepThroughTrampolinePlan(Thread & thread,bool stop_others)127 DynamicLoaderStatic::GetStepThroughTrampolinePlan(Thread &thread,
128 bool stop_others) {
129 return ThreadPlanSP();
130 }
131
CanLoadImage()132 Status DynamicLoaderStatic::CanLoadImage() {
133 Status error;
134 error.SetErrorString("can't load images on with a static debug session");
135 return error;
136 }
137
Initialize()138 void DynamicLoaderStatic::Initialize() {
139 PluginManager::RegisterPlugin(GetPluginNameStatic(),
140 GetPluginDescriptionStatic(), CreateInstance);
141 }
142
Terminate()143 void DynamicLoaderStatic::Terminate() {
144 PluginManager::UnregisterPlugin(CreateInstance);
145 }
146
GetPluginDescriptionStatic()147 llvm::StringRef DynamicLoaderStatic::GetPluginDescriptionStatic() {
148 return "Dynamic loader plug-in that will load any images at the static "
149 "addresses contained in each image.";
150 }
151