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 for (ModuleSP module_sp : module_list.Modules()) {
88 if (module_sp) {
89 bool changed = false;
90 ObjectFile *image_object_file = module_sp->GetObjectFile();
91 if (image_object_file) {
92 SectionList *section_list = image_object_file->GetSectionList();
93 if (section_list) {
94 // All sections listed in the dyld image info structure will all
95 // either be fixed up already, or they will all be off by a single
96 // slide amount that is determined by finding the first segment that
97 // is at file offset zero which also has bytes (a file size that is
98 // greater than zero) in the object file.
99
100 // Determine the slide amount (if any)
101 const size_t num_sections = section_list->GetSize();
102 size_t sect_idx = 0;
103 for (sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
104 // Iterate through the object file sections to find the first
105 // section that starts of file offset zero and that has bytes in
106 // the file...
107 SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
108 if (section_sp) {
109 // If this section already has a load address set in the target,
110 // don't re-set it to the file address. Something may have
111 // set it to a more correct value already.
112 if (m_process->GetTarget()
113 .GetSectionLoadList()
114 .GetSectionLoadAddress(section_sp) !=
115 LLDB_INVALID_ADDRESS) {
116 continue;
117 }
118 if (m_process->GetTarget().SetSectionLoadAddress(
119 section_sp, section_sp->GetFileAddress()))
120 changed = true;
121 }
122 }
123 }
124 }
125
126 if (changed)
127 loaded_module_list.AppendIfNeeded(module_sp);
128 }
129 }
130
131 m_process->GetTarget().ModulesDidLoad(loaded_module_list);
132 }
133
134 ThreadPlanSP
GetStepThroughTrampolinePlan(Thread & thread,bool stop_others)135 DynamicLoaderStatic::GetStepThroughTrampolinePlan(Thread &thread,
136 bool stop_others) {
137 return ThreadPlanSP();
138 }
139
CanLoadImage()140 Status DynamicLoaderStatic::CanLoadImage() {
141 Status error;
142 error.SetErrorString("can't load images on with a static debug session");
143 return error;
144 }
145
Initialize()146 void DynamicLoaderStatic::Initialize() {
147 PluginManager::RegisterPlugin(GetPluginNameStatic(),
148 GetPluginDescriptionStatic(), CreateInstance);
149 }
150
Terminate()151 void DynamicLoaderStatic::Terminate() {
152 PluginManager::UnregisterPlugin(CreateInstance);
153 }
154
GetPluginDescriptionStatic()155 llvm::StringRef DynamicLoaderStatic::GetPluginDescriptionStatic() {
156 return "Dynamic loader plug-in that will load any images at the static "
157 "addresses contained in each image.";
158 }
159