1 //===-- SectionLoadList.cpp -------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Target/SectionLoadList.h"
11 
12 // C Includes
13 // C++ Includes
14 // Other libraries and framework includes
15 // Project includes
16 #include "lldb/Core/Log.h"
17 #include "lldb/Core/Module.h"
18 #include "lldb/Core/Section.h"
19 #include "lldb/Core/Stream.h"
20 #include "lldb/Symbol/Block.h"
21 #include "lldb/Symbol/Symbol.h"
22 #include "lldb/Symbol/SymbolContext.h"
23 
24 using namespace lldb;
25 using namespace lldb_private;
26 
27 
28 bool
29 SectionLoadList::IsEmpty() const
30 {
31     Mutex::Locker locker(m_mutex);
32     return m_addr_to_sect.empty();
33 }
34 
35 void
36 SectionLoadList::Clear ()
37 {
38     Mutex::Locker locker(m_mutex);
39     m_addr_to_sect.clear();
40     m_sect_to_addr.clear();
41 }
42 
43 addr_t
44 SectionLoadList::GetSectionLoadAddress (const lldb::SectionSP &section) const
45 {
46     // TODO: add support for the same section having multiple load addresses
47     addr_t section_load_addr = LLDB_INVALID_ADDRESS;
48     if (section)
49     {
50         Mutex::Locker locker(m_mutex);
51         sect_to_addr_collection::const_iterator pos = m_sect_to_addr.find (section.get());
52 
53         if (pos != m_sect_to_addr.end())
54             section_load_addr = pos->second;
55     }
56     return section_load_addr;
57 }
58 
59 bool
60 SectionLoadList::SetSectionLoadAddress (const lldb::SectionSP &section, addr_t load_addr, bool warn_multiple)
61 {
62     LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER | LIBLLDB_LOG_VERBOSE));
63 
64     if (log)
65     {
66         const FileSpec &module_file_spec (section->GetModule()->GetFileSpec());
67         log->Printf ("SectionLoadList::%s (section = %p (%s%s%s.%s), load_addr = 0x%16.16llx)",
68                      __FUNCTION__,
69                      section.get(),
70                      module_file_spec.GetDirectory().AsCString(),
71                      module_file_spec.GetDirectory() ? "/" : "",
72                      module_file_spec.GetFilename().AsCString(),
73                      section->GetName().AsCString(),
74                      load_addr);
75     }
76 
77     if (section->GetByteSize() == 0)
78         return false; // No change
79 
80     // Fill in the section -> load_addr map
81     Mutex::Locker locker(m_mutex);
82     sect_to_addr_collection::iterator sta_pos = m_sect_to_addr.find(section.get());
83     if (sta_pos != m_sect_to_addr.end())
84     {
85         if (load_addr == sta_pos->second)
86             return false; // No change...
87         else
88             sta_pos->second = load_addr;
89     }
90     else
91         m_sect_to_addr[section.get()] = load_addr;
92 
93     // Fill in the load_addr -> section map
94     addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
95     if (ats_pos != m_addr_to_sect.end())
96     {
97         // Some sections are ok to overlap, and for others we should warn. When
98         // we have multiple load addresses that correspond to a section, we will
99         // allways attribute the section to the be last section that claims it
100         // exists at that address. Sometimes it is ok for more that one section
101         // to be loaded at a specific load address, and other times it isn't.
102         // The "warn_multiple" parameter tells us if we should warn in this case
103         // or not. The DynamicLoader plug-in subclasses should know which
104         // sections should warn and which shouldn't (darwin shared cache modules
105         // all shared the same "__LINKEDIT" sections, so the dynamic loader can
106         // pass false for "warn_multiple").
107         if (warn_multiple && section != ats_pos->second)
108         {
109             ModuleSP module_sp (section->GetModule());
110             if (module_sp)
111             {
112                 module_sp->ReportWarning ("address 0x%16.16llx maps to more than one section: %s.%s and %s.%s",
113                                           load_addr,
114                                           module_sp->GetFileSpec().GetFilename().GetCString(),
115                                           section->GetName().GetCString(),
116                                           ats_pos->second->GetModule()->GetFileSpec().GetFilename().GetCString(),
117                                           ats_pos->second->GetName().GetCString());
118             }
119         }
120         ats_pos->second = section;
121     }
122     else
123         m_addr_to_sect[load_addr] = section;
124 
125     return true;    // Changed
126 }
127 
128 size_t
129 SectionLoadList::SetSectionUnloaded (const lldb::SectionSP &section_sp)
130 {
131     size_t unload_count = 0;
132 
133     if (section_sp)
134     {
135         LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER | LIBLLDB_LOG_VERBOSE));
136 
137         if (log)
138         {
139             const FileSpec &module_file_spec (section_sp->GetModule()->GetFileSpec());
140             log->Printf ("SectionLoadList::%s (section = %p (%s%s%s.%s))",
141                          __FUNCTION__,
142                          section_sp.get(),
143                          module_file_spec.GetDirectory().AsCString(),
144                          module_file_spec.GetDirectory() ? "/" : "",
145                          module_file_spec.GetFilename().AsCString(),
146                          section_sp->GetName().AsCString());
147         }
148 
149         Mutex::Locker locker(m_mutex);
150 
151         sect_to_addr_collection::iterator sta_pos = m_sect_to_addr.find(section_sp.get());
152         if (sta_pos != m_sect_to_addr.end())
153         {
154             addr_t load_addr = sta_pos->second;
155             m_sect_to_addr.erase (sta_pos);
156 
157             addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
158             if (ats_pos != m_addr_to_sect.end())
159                 m_addr_to_sect.erase (ats_pos);
160         }
161     }
162     return unload_count;
163 }
164 
165 bool
166 SectionLoadList::SetSectionUnloaded (const lldb::SectionSP &section_sp, addr_t load_addr)
167 {
168     LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER | LIBLLDB_LOG_VERBOSE));
169 
170     if (log)
171     {
172         const FileSpec &module_file_spec (section_sp->GetModule()->GetFileSpec());
173         log->Printf ("SectionLoadList::%s (section = %p (%s%s%s.%s), load_addr = 0x%16.16llx)",
174                      __FUNCTION__,
175                      section_sp.get(),
176                      module_file_spec.GetDirectory().AsCString(),
177                      module_file_spec.GetDirectory() ? "/" : "",
178                      module_file_spec.GetFilename().AsCString(),
179                      section_sp->GetName().AsCString(),
180                      load_addr);
181     }
182     bool erased = false;
183     Mutex::Locker locker(m_mutex);
184     sect_to_addr_collection::iterator sta_pos = m_sect_to_addr.find(section_sp.get());
185     if (sta_pos != m_sect_to_addr.end())
186     {
187         erased = true;
188         m_sect_to_addr.erase (sta_pos);
189     }
190 
191     addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
192     if (ats_pos != m_addr_to_sect.end())
193     {
194         erased = true;
195         m_addr_to_sect.erase (ats_pos);
196     }
197 
198     return erased;
199 }
200 
201 
202 bool
203 SectionLoadList::ResolveLoadAddress (addr_t load_addr, Address &so_addr) const
204 {
205     // First find the top level section that this load address exists in
206     Mutex::Locker locker(m_mutex);
207     if (!m_addr_to_sect.empty())
208     {
209         addr_to_sect_collection::const_iterator pos = m_addr_to_sect.lower_bound (load_addr);
210         if (pos != m_addr_to_sect.end())
211         {
212             if (load_addr != pos->first && pos != m_addr_to_sect.begin())
213                 --pos;
214             if (load_addr >= pos->first)
215             {
216                 addr_t offset = load_addr - pos->first;
217                 if (offset < pos->second->GetByteSize())
218                 {
219                     // We have found the top level section, now we need to find the
220                     // deepest child section.
221                     return pos->second->ResolveContainedAddress (offset, so_addr);
222                 }
223             }
224         }
225         else
226         {
227             // There are no entries that have an address that is >= load_addr,
228             // so we need to check the last entry on our collection.
229             addr_to_sect_collection::const_reverse_iterator rpos = m_addr_to_sect.rbegin();
230             if (load_addr >= rpos->first)
231             {
232                 addr_t offset = load_addr - rpos->first;
233                 if (offset < rpos->second->GetByteSize())
234                 {
235                     // We have found the top level section, now we need to find the
236                     // deepest child section.
237                     return rpos->second->ResolveContainedAddress (offset, so_addr);
238                 }
239             }
240         }
241     }
242     so_addr.Clear();
243     return false;
244 }
245 
246 void
247 SectionLoadList::Dump (Stream &s, Target *target)
248 {
249     Mutex::Locker locker(m_mutex);
250     addr_to_sect_collection::const_iterator pos, end;
251     for (pos = m_addr_to_sect.begin(), end = m_addr_to_sect.end(); pos != end; ++pos)
252     {
253         s.Printf("addr = 0x%16.16llx, section = %p: ", pos->first, pos->second.get());
254         pos->second->Dump (&s, target, 0);
255     }
256 }
257 
258 
259